Cold ironing, also known as shore connection, or shore-to ship power, or alternative maritime power (AMP) is the process of generation and providing of shoreside electrical power to a ship while at berth. In this way the boat can disconnect the main engines and thus reduce pollution emissions, local noise and fuel consumption. Historically the process of cooling the boilers of the coal engines when the ships arrive at a port it is known as Cold ironing. That term has been maintained to date. Nowadays Cold Ironing is a key concept inserted in the Greenshipping trend.